Azure for Students: Do free 750-hr B-series VM hours survive temporary resize to a paid SKU?

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Azure for Students: Do free 750-hr B-series VM hours survive temporary resize to a paid SKU?

Riad 20

I'm using the Azure for Students subscription ($100 credit + free services for 12 months) and want to confirm how the free 750 monthly hours for burstable B-series VMs work before I set up my workflow, so I can avoid unexpected charges.

My questions:

Which exact VM SKUs currently qualify for the 750 free monthly hours under Azure for Students? I've seen references to B1s, B2ts_v2, B2ats_v2, and B2pts_v2 ?
I'm planning a hybrid usage model: running one qualifying free-tier VM (e.g., B2ts_v2) most of the time at no cost, and occasionally resizing it up temporarily to a paid SKU (e.g., B2s) for short, resource-intensive sessions, then resizing back down afterward.
- Does resizing a VM between a free-tier SKU and a paid SKU affect my 750 free hours in any way (e.g., resetting eligibility, disqualifying the VM instance, or causing retroactive charges)?
- Once I resize back down to a qualifying free-tier SKU, does the VM immediately resume being covered by the free hours (assuming I haven't exceeded 750 hours that month on qualifying SKUs)?
Are the 750 free hours calculated per VM instance, or pooled across the subscription regardless of how many times I create/delete/resize VMs within the month?
Is there anything else (disk type, region, networking configuration) that could cause a technically-qualifying B-series VM to be billed unexpectedly?

For context: I plan to use this VM for coursework and personal, non-commercial cybersecurity learning/practice (e.g., running open-source recon and scanning tools against systems I own or am explicitly authorized to test, such as bug bounty programs with defined scope).

I'd appreciate written confirmation so I can plan my usage accurately within my credit. Thank you for your help.

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Answer 1

AFAIK, the Azure for Students subscription provides 750 free monthly hours for Standard_B1s (Intel-based), Standard_B2ats_v2 (AMD-based), and Standard_B2pts_v2 (ARM-based). Although Standard_B2ts_v2 may appear in documentation for general Azure Free accounts, its availability for student subscriptions can be restricted by regional capacity and subscription quotas.

Resizing a VM between a qualifying free SKU and a paid SKU, such as Standard_B2s, does not disqualify the VM, reset your free-hour eligibility, or result in retroactive charges. Azure tracks usage based on the time the VM spends on each SKU. For example, if a VM runs for 45 minutes on Standard_B2ats_v2 and 15 minutes on Standard_B2s during an hour, the 45 minutes on the qualifying SKU count toward the 750 free hours, while the 15 minutes on the paid SKU consume your student credit. When you resize the VM back to a qualifying free SKU, its usage again qualifies for the free-hour allocation.

The 750 free hours are pooled across the entire subscription rather than being assigned to a particular VM. You can create, delete, and resize multiple VMs, and Azure aggregates the usage of all qualifying VM SKUs. If the combined usage of those qualifying VMs is 750 hours or less during the monthly allocation period, that VM compute usage is covered by the free allowance.

Other resources associated with the VM can still consume your $100 Azure for Students credit even when the VM itself qualifies for free compute. For example, the OS disk must remain within the applicable free-tier disk limit. Many marketplace images default to a 127 GiB P10 disk, so you may need to explicitly select a 64 GiB or smaller disk. Data disks are not included in the free allowance and can generate charges.

Public IP configuration can also affect your charges. A qualifying VM may still incur costs if you attach a billable Standard SKU static public IP. The region also matters because student subscriptions can have restricted VM capacity and quotas. If deployment returns a NotAvailableForSubscription error, try another supported region where the selected SKU is available. Finally, the free bandwidth allowance is limited to 15 GB of outbound data transfer per month. Inbound data transfer is free, but outbound traffic exceeding the included allowance can consume your student credit.

More at https://techcommunity.microsoft.com/discussions/microsoft-learn-for-educators/sku-quota-and-policy-restrictions-on-azure-for-students-and-free-subscriptions/4525160

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hth

Marcin